Discovery certificate for object 2018lcl
TNS Astronomical Transient Report No. 27582 [ 2018TNSTR2005....1C ]

Date Received (UTC): 2018-12-30 21:28:29
Sender: Emmanuel Conseil
Source Group: None

Emmanuel Conseil report/s the discovery of a new astronomical transient.

IAU Designation: AT 2018lcl
Coordinates (J2000): RA = 00:42:26.240 (10.609333) DEC = +41:04:00.90 (41.066917)
Discovery date: 2018-12-30 20:31:00 (JD=2458483.3548611)

Potential host galaxy: M31

Remarks: Emmanuel Conseil reports the discovery of a probable nova in M31, located 00 42 26.24 +41 04 00.9 at magnitude 16.4 CV on 2018-12-30 at 20:31 UTC. The object is visible on 3 images (50s exposures) taken with Slooh robotic telescope T2 (Corrected Dall-Kirkham 17" + FLI PL16803). The object is also visible at the same location with the same telescope at 21h25 UTC (Image available here : https://www.flickr.com/photos/econseil/45618427635 ) and with Slooh robotic UWF telescope (Apochromatic Televue refractor T2, 85mm F/7, focal reducer 0.8x, SBIG ST-10XME) at 20h30 UTC and 21h25 UTC. There was nothing at this location on images taken on 2018-12-28 at 21h15 UTC with the same telescope. There's no known object at this location in TOCP, TNS, AstronomersTelegrams and SIMBAD. No known asteroid either at this location. The object is very close to the location of previous nova M31N 2009-09a, and could be a new outburst of this transient.

Photometry

Discovery (first detection):
Discovery date: 2018-12-30 20:31:00
Flux: 16.4 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: The object is visible on 3 images (50s exposures) taken with Slooh robotic telescope T2 (Corrected Dall-Kirkham 17" + FLI PL16803).

Last non-detection:
Last non-detection date: 2018-12-28 21:15:00
Limiting flux: 19 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: Nothing visible on 3 images (50s exposures) taken with Slooh robotic telescope T2 (Corrected Dall-Kirkham 17" + FLI PL16803).

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2018lcl